Johnny Galecki is a Belgian-born American actor, best known for his roles as David Healy in Roseanne, Rusty Griswold in National Lampoon's Christmas Vacation, and as Leonard Hofstadter in The Big Bang Theory.
The Conners
2018 - • David Healy
Family Guy
1999 - • Leonard Hofstadter (voice)
American Dad!
2005 - • Arnie (voice)
Entertainment Tonight
1981 - • Self
Stars in the House
2020 - • Self
Conan
2010 - 2021 • Self
Lip Sync Battle
2015 - 2019 • Self
The Big Bang Theory
2007 - 2019 • Leonard Hofstadter
A Dog's Journey
2019 • Henry Montgomery
SciJinks
2018 - • Himself - Host
Roseanne
1988 - 2018 • David Healy
The Cleanse
2016 • Paul Berger
Rings
2017 • Gabriel Brown
The Late Late Show with Craig Ferguson
2005 - 2015 • Self
CBGB
2013 • Terry Ork
In Time
2011 • Borel
Table for Three
2009 • Ted
My Name Is Earl
2005 - 2009 • Scott
Hancock
2008 • Jeremy
Boulevard of Broken Dreams
2007 - • (archive footage)
Hope & Faith
2003 - 2006 • Jay
LAX
2004 - 2005 • Leland Pressman
Happy Endings
2005 • Miles (uncredited)
Chrystal
2004 • Barry
Bookies
2003 • Jude
Batman Beyond
1999 - 2001 • Knux (voice)
Vanilla Sky
2001 • Peter Brown
Bounce
2000 • Seth
Playing Mona Lisa
2000 • Arthur
Morgan's Ferry
2001 • Darcy
The Opposite of Sex
1998 • Jason Bock
Suicide Kings
1997 • Ira Reder
I Know What You Did Last Summer
1997 • Max Neurick
Bean
1997 • Stingo Wheelie
Murder at My Door
1996 • Teddy McNair
Blossom
1990 - 1995 • Jason
Without Consent
1994 • Marty
A Family Torn Apart
1993 • Daniel Hannigan
Civil Wars
1991 - 1993 • Greg Stolbach
Billy
1992 - • David MacGregor
Backfield in Motion
1991 • Tim Seavers
American Dreamer
1990 - 1991 • Danny Nash
In Defense of a Married Man
1990 • Eric
Hardball
1989 - 1990
Blind Faith
1990 - 1990 • John Marshall
National Lampoon's Christmas Vacation
1989 • Russell 'Rusty' Griswold
Prancer
1989 • Billy Quinn
A Night in the Life of Jimmy Reardon
1988 • Toby Reardon
Murder Ordained
1987 • Doug Rule
2018 - • Executive Producer
2016 • Producer